Expert evaluation is a method for investigating some aspect of usability or appropriateness of a system according to pre-definined guidelines, principles or checklists - or some times these are also called heuristics (e.g. Nielsen's heuristics). If usability methods are grouped according to the methods having end-users or not having end-users involved, expert evaluation belongs to the not having end-users involved methods. The expert evaluation is often also considered to be that kind of method that can be used in any phase of the system development (therefore saying that mock-ups, "partially implemented" prototypes
, or fully implemented can be inspected by using this method). Therefore, with the other prominent grouping manner of usability methods into formative or summative methods, expert evaluation belongs to both. Expert evaluations should never be used alone in evaluating and testing a system. It finds somewhat different kind of problems than the other methods.
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